Tag Parser: avc/avcconfiguration.cpp Source File

Tag Parser 12.5.3 C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags

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avcconfiguration.cpp
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1#include "./avcconfiguration.h"
2
3#include "../diagnostics.h"
4#include "../exceptions.h"
5#include "../mediaformat.h"
6
7#include <c++utilities/io/binaryreader.h>
8
9#include <limits>
10
11using namespace std;
12using namespace CppUtilities;
13
14namespace TagParser {
15
20
25 void AvcConfiguration::parse(BinaryReader &reader, std::uint64_t maxSize, Diagnostics &diag)
26{
27 if (maxSize < 7) {
28 throw TruncatedDataException();
29 }
30 maxSize -= 7;
31
32 reader.stream()->seekg(1, ios_base::cur); // always 1
33 profileIndication = reader.readByte();
34 profileCompat = reader.readByte();
35 levelIndication = reader.readByte();
36 naluSizeLength = (reader.readByte() & 0x03) + 1;
37
38 // read SPS info entries
39 std::uint8_t spsEntryCount = reader.readByte() & 0x0f;
40 std::uint8_t ignoredSpsEntries = 0;
41 spsInfos.reserve(spsEntryCount);
42 for (; spsEntryCount; --spsEntryCount) {
43 if (maxSize < SpsInfo::minSize) {
44 throw TruncatedDataException();
45 }
46 auto error = false;
47 try {
48 spsInfos.emplace_back().parse(
49 reader, maxSize > numeric_limits<std::uint32_t>::max() ? numeric_limits<std::uint32_t>::max() : static_cast<std::uint32_t>(maxSize));
50 } catch (const TruncatedDataException &) {
51 if (spsInfos.back().size > (maxSize - SpsInfo::minSize)) {
52 throw; // sps info looks bigger than bytes to read
53 }
54 error = true; // sps info exceeds denoted size
55 } catch (const Failure &) {
56 error = true;
57 }
58 maxSize -= spsInfos.back().size;
59 if (error) {
60 spsInfos.pop_back();
61 ++ignoredSpsEntries;
62 }
63 }
64
65 // read PPS info entries
66 std::uint8_t ppsEntryCount = reader.readByte();
67 std::uint8_t ignoredPpsEntries = 0;
68 ppsInfos.reserve(ppsEntryCount);
69 for (; ppsEntryCount; --ppsEntryCount) {
70 if (maxSize < PpsInfo::minSize) {
71 throw TruncatedDataException();
72 }
73 auto error = false;
74 try {
75 ppsInfos.emplace_back().parse(
76 reader, maxSize > numeric_limits<std::uint32_t>::max() ? numeric_limits<std::uint32_t>::max() : static_cast<std::uint32_t>(maxSize));
77 } catch (const TruncatedDataException &) {
78 if (ppsInfos.back().size > (maxSize - PpsInfo::minSize)) {
79 throw; // pps info looks bigger than bytes to read
80 }
81 error = true; // pps info exceeds denoted size
82 } catch (const Failure &) {
83 error = true;
84 }
85 maxSize -= ppsInfos.back().size;
86 if (error) {
87 ppsInfos.pop_back();
88 ++ignoredPpsEntries;
89 }
90 }
91
92 // log parsing errors
93 if (ignoredSpsEntries || ignoredPpsEntries) {
94 diag.emplace_back(DiagLevel::Debug,
95 argsToString(
96 "Ignored ", ignoredSpsEntries, " SPS entries and ", ignoredPpsEntries, " PPS entries. This AVC config is likely just not supported."),
97 "parsing AVC config");
98 }
99
100 // ignore remaining data
101}
102
103} // namespace TagParser
avcconfiguration.h
TagParser::Diagnostics
The Diagnostics class is a container for DiagMessage.
Definition diagnostics.h:156
TagParser::Failure
The class inherits from std::exception and serves as base class for exceptions thrown by the elements...
Definition exceptions.h:11
TagParser::TruncatedDataException
The exception that is thrown when the data to be parsed is truncated and therefore can not be parsed ...
Definition exceptions.h:39
diagnostics.h
exceptions.h
mediaformat.h
CppUtilities
Definition abstractcontainer.h:16
TagParser
Contains all classes and functions of the TagInfo library.
Definition aaccodebook.h:10
TagParser::DiagLevel::Debug
@ Debug
Definition diagnostics.h:18
TagParser::AvcConfiguration::spsInfos
std::vector< SpsInfo > spsInfos
Definition avcconfiguration.h:19
TagParser::AvcConfiguration::parse
void parse(CppUtilities::BinaryReader &reader, std::uint64_t maxSize, Diagnostics &diag)
Parses the AVC configuration using the specified reader.
Definition avcconfiguration.cpp:25
TagParser::AvcConfiguration::profileIndication
std::uint8_t profileIndication
Definition avcconfiguration.h:15
TagParser::AvcConfiguration::levelIndication
std::uint8_t levelIndication
Definition avcconfiguration.h:17
TagParser::AvcConfiguration::profileCompat
std::uint8_t profileCompat
Definition avcconfiguration.h:16
TagParser::AvcConfiguration::ppsInfos
std::vector< PpsInfo > ppsInfos
Definition avcconfiguration.h:20
TagParser::AvcConfiguration::naluSizeLength
std::uint8_t naluSizeLength
Definition avcconfiguration.h:18
TagParser::PpsInfo::minSize
static constexpr std::uint16_t minSize
Definition avcinfo.h:128
TagParser::SpsInfo::minSize
static constexpr std::uint16_t minSize
Definition avcinfo.h:96